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I recently obtained a shiny (really, stainless) new (used actually) flowhood. I want to replace the prefilter before putting the machine to use. The existing prefilter, which is dingy and sagging form sitting horizontally, measures 1"X36"X18". This is not a size carried by any stores in my area and special orders require a minimum of 12 units ordered.. Online ordering is an option but I haven't found a price I like. I'm considering building my own frame and using some sort of replacable filter filler. I have not idea what material would be suitable. Any input will be greatly appreciated.